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A push button is a typical switch mechanism to control some system activity. There are many push buttons in the market with different models and different shapes and mechanisms. Push buttons actually perform a function when pressed by the operator. Push buttons can be momentary, that is, they act as soon as we press it and return to their original state if we release our hands from it, or they can act in such a way that they act by pressing it and in It remains in the same position and returns to its first position by being compressed again.
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## Cover the buttons in terms of color:
Push buttons are also made in different colors, each of these colors represents a type of function. For example, red color is used to step the system and green color is used to start or start the machine. This feature prevents the operator from making mistakes while working with these keys.
Also, a series of push buttons in red color have bigger heads than other push buttons, which are called mushroom keys in the industry and are used as emergency chassis in the system. This type of mushroom push button is designed in two ways, with key and simple, for use in different places. Depending on the limitations of the system, the push buttons are made of plastic or metal, which have a simple or waterproof function available in the market.
## In terms of performance status:
In order to show the status of some push buttons to the operator, a light is installed on them, and if the light turns on, the operator will know that this key has worked.
### Things to consider when buying push buttons:
push button type (for example, start or step)
Type of operation (for example, momentary or permanent)
Combination of contacts (1NO 1NC)
The diameter of the installation location of the push button on the panel
The voltage of the light, if the light is on, push the button
Ability to replace contacts
Tolerable current of contacts
Allowed number of disconnections and connections
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